Patent US4511508A successfully refreshed from Google Patents.
US4511508A
Expired / Lapsed
US
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Process for drying of natural extracts prepared by high pressure extraction
Assignee: Evonik Operations GmbH
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Filing: 1982-04-27
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Granted: 1985-04-16
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Expires: 2002-04-27
Abstract
Abstract A method is described for drying extracts of natural substances obtained by high-pressure extraction with liquefied gases or gases in the supercritical state; it consists in treating the gas stream that is charged with the extract with a solid drying agent, preferably calcium sulfate, in powder or granular form.
Inventors
- 👤 Heinz-Rudiger Vollbrecht
- 👤 Erwin Schutz
- 👤 Klaus Sandner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:54
CPC Classifications
C; C12; C12C; C12C3/00; C12C3/04; C12C3/08; C12C3/10; A; A23; A23L; A23L27/00; A23L27/10; A23L27/11; B; B01; B01D; B01D11/00; B01D11/02; B01D11/0203
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
54 words
A process for drying extracts of plant or plant part origin obtained by high-pressure extraction with liquefied gases or gases in the supercritical state whereafter the extract is recovered from the gas stream, wherein the improvement comprises the step of removing moisture from the gas stream laden with the extract, before recovering the extract.
Claim 2
Dependent Claim
54 words
A process for drying extracts of plant or plant part origin obtained by high-pressure extraction with liquefied gases or gases in the supercritical state whereafter the extract is recovered from the gas stream, wherein the improvement comprises the step of removing moisture from the gas stream laden with the extract, before recovering the extract.
Claim 3
Dependent Claim
75 words
A process for drying extracts of plant or plant part origin obtained by high-pressure extraction with liquefied gases or gases in the supercritical state whereafter the extract is recovered from the gas stream, wherein the improvement comprises the step of removing moisture from the gas stream laden with the extract, before recovering the extract, by passing the gas stream laden with the extract over and/or through a solid drying agent in powder or granular form.
Claim 4
Dependent Claim
75 words
A process for drying extracts of plant or plant part origin obtained by high-pressure extraction with liquefied gases or gases in the supercritical state whereafter the extract is recovered from the gas stream, wherein the improvement comprises the step of removing moisture from the gas stream laden with the extract, before recovering the extract, by passing the gas stream laden with the extract over and/or through a solid drying agent in powder or granular form.
Claim 5
Dependent Claim
21 words
The process of claim 2 wherein the drying agent is silica gel, magnesium oxide, aluminum oxide, bleaching earth or calcium sulfate.
Claim 6
Dependent Claim
12 words
The process of claim 3 wherein the liquified gas comprises carbon dioxide.
Claim 7
Dependent Claim
14 words
The process of claim 3, wherein calcium sulfate is used as the drying agent.
Claim 8
Dependent Claim
29 words
The process of claim 5, further comprising the steps of regenerating the calcium sulfate containing moisture, by treatment with hot air at a temperature of 100° to 300° C.
Claim 9
Dependent Claim
13 words
The process of claim 6 wherein the temperature used is about 170° C.
Claim 10
Dependent Claim
93 words
The process of claim 2 or 3 wherein there are provided two separate dryers containing the drying agent for treating the gas stream, further comprising the steps of passing the gas stream through a first one of the two dryers while simultaneously subjecting the drying agent in the second one of said dryers to treatment with hot air at a temperature of 100° C. to 300° C. to regenerate the drying agent therein, and thereafter, passing the gas stream through the second dryer while simultaneously regenerating the drying agent in the first dryer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |